Merge remote-tracking branch 'remotes/mdroth/tags/qga-pull-2021-03-16-tag' into staging

Merge remote-tracking branch 'remotes/mdroth/tags/qga-pull-2021-03-16-tag' into staging

qemu-ga patch queue for soft-freeze

* fix guest-get-vcpus reporting after vcpu unplug
* coding style fix-ups
* report a reason for disabled commands

# gpg: Signature made Wed 17 Mar 2021 03:12:41 GMT
# gpg:                using RSA key CEACC9E15534EBABB82D3FA03353C9CEF108B584
# gpg: Good signature from "Michael Roth <flukshun@gmail.com>" [full]
# gpg:                 aka "Michael Roth <mdroth@utexas.edu>" [full]
# gpg:                 aka "Michael Roth <mdroth@linux.vnet.ibm.com>" [full]
# Primary key fingerprint: CEAC C9E1 5534 EBAB B82D  3FA0 3353 C9CE F108 B584

* remotes/mdroth/tags/qga-pull-2021-03-16-tag:
  qga: return a more explicit error on why a command is disabled
  qga: Switch and case should be at the same indent
  qga: Open brace '{' following struct go on the same
  qga: Delete redundant spaces
  qga: Add spaces around operator
  qga: Correct loop count in qmp_guest_get_vcpus()

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>